Datasheet AD7194 (Analog Devices) - 7

AD7194 Data Sheet Parameter Min Typ Max Unit Test Conditions/Comments1
SYSTEM CALIBRATION2 Full-Scale Calibration Limit 1.05 × FS V Zero-Scale Calibration −1.05 × FS V Limit Input Span 0.8 × FS 2.1 × FS V POWER REQUIREMENTS7 Power Supply Voltage AVDD − AGND 3 5.25 V DVDD − DGND 2.7 5.25 V Power Supply Currents AIDD Current 0.85 1.1 mA Gain = 1, buffer off 1 1.35 mA Gain = 1, buffer on 2.8 3.6 mA Gain = 8, buffer off 3.2 3.85 mA Gain = 8, buffer on 3.8 4.7 mA Gain = 16 to 128, buffer off 4.3 5.3 mA Gain = 16 to 128, buffer on DIDD Current 0.35 0.4 mA DVDD = 3 V 0.5 0.6 mA DVDD = 5 V 1.5 mA External crystal used IDD 3 µA Power-down mode 1 Temperature range: −40°C to +105°C. 2 Specification is not production tested, but is supported by characterization data at initial product release. 3 FS[9:0] is the decimal equivalent of Bit FS9 to Bit FS0 in the mode register. 4 Following a system or internal zero-scale calibration, the offset error is in the order of the noise for the programmed gain and output data rate selected. A system full-scale calibration reduces the gain error to the order of the noise for the programmed gain and output data rate. 5 The analog inputs are configured for differential mode. 6 REJ60 is a bit in the mode register. When the first notch of the sinc filter is at 50 Hz, a notch is placed at 60 Hz when REJ60 is set to 1. This gives simultaneous 50 Hz/60 Hz rejection. 7 Digital inputs equal to DVDD or DGND. Rev. B | Page 6 of 54 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS Circuit and Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS RMS NOISE AND RESOLUTION SINC4 CHOP DISABLED SINC3 CHOP DISABLED FAST SETTLING ON-CHIP REGISTERS COMMUNICATIONS REGISTER RS2, RS1, RS0 = 000 STATUS REGISTER RS2, RS1, RS0 = 000; Power-On/Reset = 0x80 MODE REGISTER RS2, RS1, RS0 = 001; Power-On/Reset = 0x080060 CONFIGURATION REGISTER RS2, RS1, RS0 = 010; Power-On/Reset = 0x000117 Channel Selection (Pseudo Bit = 0) DATA REGISTER RS2, RS1, RS0 = 011; Power-On/Reset = 0x000000 ID REGISTER RS2, RS1, RS0 = 100; Power-On/Reset = 0xX3 GPOCON REGISTER RS2, RS1, RS0 = 101; Power-On/Reset = 0x00 OFFSET REGISTER RS2, RS1, RS0 = 110; Power-On/Reset = 0x800000) FULL-SCALE REGISTER RS2, RS1, RS0 = 111; Power-On/Reset = 0x5XXXX0 ADC CIRCUIT INFORMATION OVERVIEW Analog Inputs Multiplexer PGA Reference Detect Burnout Currents Σ-Δ ADC and Filter Serial Interface Clock Temperature Sensor Digital Outputs Calibration ANALOG INPUT CHANNEL PROGRAMMABLE GAIN ARRAY (PGA) REFERENCE REFERENCE DETECT BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING BURNOUT CURRENTS DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read RESET SYSTEM SYNCHRONIZATION ENABLE PARITY CLOCK TEMPERATURE SENSOR LOGIC OUTPUTS CALIBRATION DIGITAL FILTER SINC4 FILTER (CHOP DISABLED) Sinc4 Output Data Rate/Settling Time Sinc4 Zero Latency Sinc4 50 Hz/60 Hz Rejection SINC3 FILTER (CHOP DISABLED) Sinc3 Output Data Rate and Settling Time Sinc3 Zero Latency Sinc3 50 Hz/60 Hz Rejection CHOP ENABLED (SINC4 FILTER) Output Data Rate and Settling Time (Sinc4 Chop Enabled) 50 Hz/60 Hz Rejection (Sinc4 Chop Enabled) CHOP ENABLED (SINC3 FILTER) Output Data Rate and Settling Time (Sinc3 Chop Enabled) 50 Hz/60 Hz Rejection (Sinc3 Chop Enabled) FAST SETTLING MODE (SINC4 FILTER) Output Data Rate and Settling Time, Sinc4 Filter 50 Hz/60 Hz Rejection, Sinc4 Filter FAST SETTLING MODE (SINC3 FILTER) Output Data Rate and Settling Time, Sinc3 Filter 50 Hz/60 Hz Rejection, Sinc3 Filter FAST SETTLING MODE (CHOP ENABLED) SUMMARY OF FILTER OPTIONS GROUNDING AND LAYOUT APPLICATIONS INFORMATION FLOWMETER OUTLINE DIMENSIONS ORDERING GUIDE